After the break in period it is not an issue.
yes you can synthetic oil can go in any engine
In a Brand new engine it is recommended that you get the rings seated before you start using Synthetic oils. So run your engine for 3,000 miles and then you can switch to a Synthetic.
SAE 10W-30 synthetic oil.
conventional. I wouldn't put synethic in it unless it has already had it in the engine. Synthetic is mostly used in high performance or new vehicles. Synthetic won't do anything for an older engine
yes
5w30 synthetic
Yes, and I highly recommend you use synthetic in an air cooled engine.
5W20 synthetic.
Lucas also makes a synthetic engine oil additive.. Yes.
Yes
Yes, you can. It is even sold as a Synthetic Blend.
When I first asked the dealer about switching to synthetic oil, he said the it already used a mixed synthetic and regular oil and that 100% synthetic was unnecessary.